SSQLS v2 :)

Hello

I'm studying expanded SSQLS code and I have a question.
As I can see,  field_list() (for example) return a temporary object of 
<ClassName>_field_list. And real output to stream operate with it. I wonder, 
what are advantages of such approach? Why we can't just return std::string in 
field_list()? Disadvantage is heavy *.h.

Thanks

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